Source : Webster's Revised Unabridged Dictionary (1913)

Forthwith \Forth`with"\ (? or ?; see {With}), adv.
   1. Immediately; without delay; directly.

            Immediately there fell from his eyes as it had been
            scales; and he received sight forthwith. --Acts ix.
                                                  18.

   2. (Law) As soon as the thing required may be done by
      reasonable exertion confined to that object. --Bouvier.

Source : WordNet®

forthwith
     adv : without delay or hesitation; with no time intervening; "he
           answered immediately"; "found an answer straightaway";
           "an official accused of dishonesty should be suspended
           forthwith"; "Come here now!" [syn: {immediately}, {instantly},
            {straightaway}, {straight off}, {directly}, {now}, {right
           away}, {at once}, {in real time}, {like a shot}]